Collaborative Research: Assessment of Groundwater Inputs into Coastal Waters of Hawaii via Natural Tracers and Aerial Imagery

在过去的几年中，已经开发了一些方法来评估局部尺度的海底地下水排放（SGD）。但是，还没有区域尺度评价（即100公里）的方法。因此，夏威夷大学的一位科学家与佛罗里达州立大学的一位科学家合作，计划开发一种三级方法，使用以下方法在区域尺度上评估进入海洋的SGD:(1)高分辨率，温度校准（0.1'C）地理校正的航空红外测量；(2)利用天然地球化学示踪剂（223Ra, 224Ra, 227, 228Th）对选定地点进行地面实验；(3)通过类型学对结果进行放大。ppi之所以选择科纳海岸作为他们的研究地点，是因为其明显的SGD高，排放的集中性质，以及缺乏地表排水。一旦确定了排放量，将计算科纳海岸的氮种、总磷、无机磷、二氧化硅和总叶绿素的通量，并将其与河流通量进行比较，置于区域和全球范围内。就更广泛的影响而言，本研究将为科学家提供一种在区域尺度上评估海底地下水排放的新方法，并为海底地下水排放对沿海海洋水收支和生物地球化学循环的影响提供新的见解。这项研究的好处将从海洋学家延伸到水文学家，再到沿海和水资源管理者。来自夏威夷大学和佛罗里达州立大学的学生将参与这项研究。

ABSTRACTOCE-0451379Over the past few years, some methods have been developed to assess submarine groundwater discharge (SGD) on a local scale. However, methodologies for regional scale evaluations (i.e., 100 km) have not occurred. For this reason, a scientist from the University of Hawaii, in collaboration with a scientist from Florida State University, plan to develop a three tiered approach to assess SGD into the sea at regional scales using the following methods: (1) high resolution, temperature calibrated (0.1'C) geo-corrected aerial infrared surveys; (2) ground-truthing selected sites via natural geochemical tracers (223Ra, 224Ra, 227Th, 228Th); and (3) upscaling the results via typology. The PIs have selected the Kona coast for their study site because of its high apparent SGD, focused nature of the discharge, and lack of surface drainage. Once discharge is established, fluxes of nitrogen species, total phosphorus, inorganic phosphorus, silica, and total chlorophyll will be calculated for the Kona coast and placed within a regional and global context by comparison to stream fluxes. As regards broader impacts, this study will provide scientists with a new method to assess submarine groundwater discharge on a regional scale, as well as yield new insights into the impact of submarine groundwater discharge on water budgets and biogeochemical cycles in the coastal ocean. The benefits of this study will extend from oceanographers to hydrologist to coastal and water resource managers. Students from both the University of Hawaii and Florida State University will participate in the research study.